Free PDF converter
TreePad-to-PDF (freeware edition) is a program that can convert
your TreePad file to a PDF file, on Windows and Linux/wine.
As you can see in the screenshot on the right, the TreePad document structure is fully preserved.
Just click on the image (to the right) if you want to see more details.

TreePad-to-PDF is compatible with TreePad Lite (freeware), and
you can also use it with any of the higher TreePad editions
(though it does not support images, hyperlinks and rich text formatting).

A screenshot of the TreePad-to-PDF program itself can be found on the lower right side of this page.